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[. . . ] Service Manual
HP DesignJet 430 HP DesignJet 450C HP DesignJet 455CA Printers
For HP Internal Use Only E Copyright HewlettPackard Company 1997 This document contains proprietary information that is protected by copyright. No part of this document may be photocopied, reproduced, or translated into another language without the prior written consent of HewlettPackard Company.
Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
WARNING The procedures described in this manual are to be performed by HP-qualified service personnel only. [. . . ] 4 Check the gauge to determine the GO and NO GO sides:
NO GO GO
5 Place the gauge on the drive roller on the left hand side of the carriage, with the GO side facing the carriage, in the position shown below:
Service Calibrations
HP DesignJet 430, 450C and 455CA Printers
5-5
Gauge Y B Gauge must be parallel to the center line of the Drive Roller
Drive Roller
6 With the gauge held in place, manually move the carriage over the GO side of the gauge. The ledge, indicated below, should easily pass over the GO side of the gauge.
WARNING
Make sure that the carriage is in the down position at all times when passing over the gauge.
Ledge
If the ledge does not go over the GO side of the gauge, adjust the carriage to media distance ' page 5 7. 7 Remove the gauge and replace it on the drive roller with the NO GO side facing the carriage. 8 With the gauge held in place, manually try to pass the carriage over the NO GO side of the gauge. The ledge, indicated above, should NOT pass over the NO GO side of the gauge. If the ledge does go over the NO GO side of the gauge, adjust the carriage to media distance ' page 5 7. 11 Close the top cover.
5-6
HP DesignJet 430, 450C and 455CA Printers
Service Calibrations
To adjust the carriage to media distance You will need to adjust the carriage to media distance if: The ledge on the carriage did not pass over the GO side of the gauge. This means that the carriage is positioned too close to the drive roller. D The ledge on the carriage did pass over the NO GO side of the gauge. This means that the carriage is positioned too far from the drive roller.
D
Adjust the carriage to media distance as follows: 1 Release the two indicated clips on the top of the cartridge carriage by pulling them slightly outwards.
Take care neither to cut yourself on the encoder strip, nor to damage the strip.
2 Pull the top of the carriage up.
Service Calibrations
HP DesignJet 430, 450C and 455CA Printers
5-7
3 Tighten or loosen the indicated screw on the carriage. This will adjust the carriage angle on the slider rod, thus increasing or decreasing the carriage to media distance.
Torx-8
Rotating Clockwise
Gap Increases
4 Check the carriage to media distance ' page 5 5. 6 Check the trailing cable to make sure that it is positioned under the plastic tabs at the back of the carriage cover, and not above them.
Trailing cable under tabs !
Otherwise, the Printer will not be able to load media.
5-8
HP DesignJet 430, 450C and 455CA Printers
Î Î
Service Calibrations
ÎÎ ÎÎ
6
Print Quality
HP DesignJet 430, 450C and 455CA Printers
6-1
Print Quality Troubleshooting Checklist
When faced with a Print Quality problem, use the following checklist as a guide in troubleshooting the problem: 1 Problem reproduction D Reproduce the problem that the customer is seeing using their original settings. 2 Printer configuration: D Print Mode: Set to Best" (in the printer and in the drivers). 3 Hardware check list
D
Check if the latest version of the firmware is installed. If not Install the latest firmware revision.
4 Cartridges Cartridge Troubleshooting Process: D If you don't have any samples yet, reproduce the original problem with the correct printer settings. D Print the Print Quality Plot using the exact settings and Media that the Customer used when faced with the Print Quality problem ' page 6 3. Cartridge Alignment: D Perform the Cartridge Alignment procedure (details ' User's Guide). D Select the correct media type through the front panel when loading it. 6 Driver print quality configuration: To clarify if the reason of the problem is related with the print mode defined with the Non HP Driver try the following: D Print the same sample using the Non HP driver and their normal media. D Print the internal demo or print the Print Quality Plot (details ' page 6 3) using HP Media and configuring the printer as indicated previously. If the output obtained using the HP Solution is good and the one obtained through the 3rd party solution is bad, HP support organization should:
D
Communicate to the customer that the problem is not in the printer and that he should address it through the 3rd party vendor support structure.
7 Accuracy Calibration (details ' Chapter 5) D Perform Accuracy calibration" using HP Matte Film.
6-2
HP DesignJet 430, 450C and 455CA Printers
Print Quality
Print Quality Plot
Introduction Whenever a Print Quality problem appears, it is advisable to print the Print Quality Plot to help diagnose the problem. The Print Quality Plot will help you differentiate between possible cartridge errors and other problems such as incorrect front panel selection, driver or RIP configuration or mechanical problems. [. . . ] Sometimes used instead of print car tridge. " pinch arm lever Pinch wheel lever, me dia jam lever. PJL Printer Job Language, developed by Hewlett Packard to give software applica tions more job level device control and to provide device status information to the ap plication. platen roller Drive roller.
media sensor calibration Media length calibration. minimum pass time The time necessary for ink to dry sufficiently before the plotter can place more ink adjacent to it. [. . . ]

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